Java 7 lines simple recursive solution

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    public TreeNode mergeTrees(TreeNode t1, TreeNode t2) {
            if(t1==null && t2==null) return null;
            if(t1==null) return t2;
            if(t2==null) return t1;
            TreeNode output = new TreeNode(t1.val+t2.val);
            output.left = mergeTrees(t1.left,t2.left);
            output.right = mergeTrees(t1.right,t2.right);
            return output;

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